Educational dataset for observing Haidinger's interference rings with microparticle scattering

This dataset accompanies the published article "Demonstration experiment for observing Haidinger’s interference rings using microparticles deposited on reflective surfaces" by Voronkin and Lushchin, published in Physics Education (2026), Volume 61, Article 045005. The dataset documents a lensless demonstration of fringes of equal inclination formed in backscattered laser light from plane-parallel glass plates and flat mirrors coated with microparticles. The materials allow qualitative visual comparison of different experimental configurations and quantitative reproduction of the interference analysis. All measurements were performed using a semiconductor laser pointer (λ ≈ 532 nm,